Dura Ace/Ultegra DI2 wire lengths on a 56cm SL-4?

Can anyone advise me on what lengths of wiring cable people have used when fitting Di2 on 56cm SL-4's? I wanted to check that the regular internal shimano cable lengths were ok or could I get away with shorter cables?

(Shifters means downtube) This was for a 54cm roobay but I'm not sure he sent those specifically from the looks of it. The best bet where you need it to look super clean would be to mount the hardware, use the 950mm in the downtube to the junction box and then measure. That's likely what I'll end up doing. Sucks lol

(Shifters means downtube) This was for a 54cm roobay but I'm not sure he sent those specifically from the looks of it. The best bet where you need it to look super clean would be to mount the hardware, use the 950mm in the downtube to the junction box and then measure. That's likely what I'll end up doing. Sucks lol

Thanks, I went for those lengths when I ordered the bits.

I am running the new 3 port junction box so I needed two 300mm cables between the shifters and the junction box.